模拟汽车驾驶所致腰部肌肉疲劳的肌电图功率谱分析

目的：对汽车驾驶员腰部肌肉疲劳的肌电图进行分析，评估汽车驾驶员腰部肌肉疲劳状况，以预防驾驶员腰背部疾病。方法：实验对象36名，分别在1．8、4．0、6．0Hz 3种竖直振动频率下模拟驾驶90min。同时，实时记录驾驶员模拟驾驶时腰部肌肉肌电图变化趋势。结果：驾驶员在3种振动频率下模拟驾驶时，腰部肌肉肌电图功率谱中值频率均呈指数下降趋势；其中4．0Hz振动频率下肌电图功率谱中值频率下降趋势最明显。结论：模拟驾驶条件下，4.0Hz振动频率对驾驶员腰部肌肉疲劳的影响最大。

Spectral analysis of electromyography of low back muscle fatigue induced by simulated driving

Objective To evaluate the effects of different vibration frequency on the back muscle fatigue during simulated driving. Methods Thirty six subjects performed three simulated driving experiments under three vertical vibration frequencies which were 1.8,4.0,6.0 Hz respectively and the driving time was 90 minutes.At the same time the electromyography of low back was recorded. Results The median frequencies calculated from the power spectrum were decreased exponentially under three vertical vibration frequencies,especially under 4.0 Hz vibration frequency. Conclusion The 4.0 Hz vibration frequency has the most important effect on the back muscle fatigue under simulated driving condition.